一、有时候在将对象或list对象转化为json的时候，我们可能不需要所有的属性值，这就需要我们去过滤掉这些属性了
我下面说两种比较流行的json包如何来忽略某些属性值
二、 使用jaskson包
1. maven配置：
<!-- Jackson Json处理工具包 --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.5</version> </dependency>
2. 在需要忽略字段属性上使用注解来配置：
//@JsonIgnoreProperties({"dict_id","dict_item_code"}) // 可以使用此注解放在类上忽略多个属性值public class BaseDict { @JsonIgnore //可以直接放在field上面表示要忽略的filed
private String dict_id; private String dict_type_code; private String dict_type_name; private String dict_item_name; private String dict_item_code; private Integer dict_sort; private String dict_enable; private String dict_memo; public String getDict_id() { return dict_id;
} public void setDict_id(String dict_id) { this.dict_id = dict_id;
} public String getDict_type_code() { return dict_type_code;
} public void setDict_type_code(String dict_type_code) { this.dict_type_code = dict_type_code;
} public String getDict_type_name() { return dict_type_name;
} public void setDict_type_name(String dict_type_name) { this.dict_type_name = dict_type_name;
} public String getDict_item_name() { return dict_item_name;
} public void setDict_item_name(String dict_item_name) { this.dict_item_name = dict_item_name;
} public String getDict_item_code() { return dict_item_code;
} public void setDict_item_code(String dict_item_code) { this.dict_item_code = dict_item_code;
} public Integer getDict_sort() { return dict_sort;
} public void setDict_sort(Integer dict_sort) { this.dict_sort = dict_sort;
} public String getDict_enable() { return dict_enable;
} public void setDict_enable(String dict_enable) { this.dict_enable = dict_enable;
} public String getDict_memo() { return dict_memo;
} public void setDict_memo(String dict_memo) { this.dict_memo = dict_memo;
}
}3. 使用封装的jsonUtils来实现操作
package com.sshcrm.utils;import java.util.List;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.JavaType;import com.fasterxml.jackson.databind.ObjectMapper;/**
* CRM自定义响应结构 */public class JsonUtils { // 定义jackson对象
private static final ObjectMapper MAPPER = new ObjectMapper(); /**
* 将对象转换成json字符串。
* <p>Title: pojoToJson</p>
* <p>Description: </p>
* @param data
* @return
*/
public static String objectToJson(Object data) { try {
String string = MAPPER.writeValueAsString(data); return string;
} catch (JsonProcessingException e) {
e.printStackTrace();
} return null;
}
/**
* 将json结果集转化为对象
*
* @param jsonData json数据
* @param clazz 对象中的object类型
* @return
*/
public static <T> T jsonToPojo(String jsonData, Class<T> beanType) { try {
T t = MAPPER.readValue(jsonData, beanType); return t;
} catch (Exception e) {
e.printStackTrace();
} return null;
}
/**
* 将json数据转换成pojo对象list
* <p>Title: jsonToList</p>
* <p>Description: </p>
* @param jsonData
* @param beanType
* @return
*/
public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) {
JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType); try {
List<T> list = MAPPER.readValue(jsonData, javaType); return list;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}三、使用json-lib包
1. maven配置
<!--json-lib依赖 --> <dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.4</version> <classifier>jdk15</classifier> </dependency>
2. 使用JsonConfig指定要忽略的属性
public String findByTypeCode() throws IOException { //调用业务层查询
List<BaseDict> result = baseDictService.findByTypeCode(baseDict.getDict_type_code()); //将list转化为json
/**
* JSONConfig: 转JSON的配置对象
* JSONAarray：将数组和list集合转成JSON
* JSONObject: 将对象和Map集合转成JSON */
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setExcludes(new String[] {"dict_sort","dict_enable","dict_memo"});
JSONArray jsonArray = JSONArray.fromObject(result, jsonConfig); //将json打印到页面
ServletActionContext.getResponse().setContentType("text/html;charset=utf-8");
ServletActionContext.getResponse().getWriter().print(jsonArray.toString()); return NONE;
}原文出处：http://www.cnblogs.com/ya-qiang/p/9364435.html